The gland indicated by red arrow is parathyroid galnd and is responsible for blood calcium concentration .
Two pairs of tiny, oval-shaped glands make up the parathyroid glands. They are situated in the neck close to the two lobes of the thyroid gland. Typically, each gland is roughly the size of a pea.
The production and release of PTH by the parathyroid glands maintains the homeostasis of serum calcium. PTH suppresses osteoblast activity and enhances osteoclast activity in the bone, which causes bone to break down and release calcium.
Four parathyroid glands, which are tiny glands in the neck beneath the thyroid, secrete the hormone parathyroid.
For more information on parathyroid gland kindly visit to https://brainly.com/question/28608533
#SPJ4